473572 - Split function in JavaScript does not produce correct result when pattern contains parentheses.

Status: RESOLVED INVALID

(Core :: JavaScript Engine, defect)

Description

[Alexey]

User-Agent:       Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; MRA 5.1 (build 02204); MRSPUTNIK 2, 0, 0, 36 SW)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1a2) Gecko/20080829082037 Shiretoko/3.1a2

Here are some JavaScript examples, that demonstrate the problem:

"abc".split(/b/g) returns ["a", "c"] is OK
But
"abc".split(/(b)/g) returns ["a", "b", "c"] and expected is ["a", "c"]

"aa".split(/a+|b+/g) returns ["",""] is OK
But
"aa".split(/(a|b)+/g) returns ["", "a", ""] and expected is ["", ""]

Reproduced on both FF 3.0.5 and FF 3.1a2

Reproducible: Always

Steps to Reproduce:
Run script:
<script>
    alert("["+"abc".split(/(b)/g).join(",")+"]");
</script>
Actual Results:  
Alert box with [a,b,c]

Expected Results:  
Alert box with [a,c]

Comment 1

[Nochum Sossonko [:Natch]]

Can you try this on the latest 3.1 build ftp://ftp.mozilla.org/pub/firefox/nightly/latest-mozilla-1.9.1/

Comment 2

[Nochum Sossonko [:Natch]]

NM, this does the same thing on 3.0.

Comment 3

[Brendan Eich [:brendan]]

See ECMA-262 Ed. 3 or 5, 15.5.4.14.

/be